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Full text of "The manufacture and properties of iron and steel"

198
METALLUBGY OF IRON AND STEEL.
will give higher phosphoric acid in the cinder, and the table shows that in the case of high phosphorus the combined Si02 and FeO runs about 27.5 per cent., with medium phosphorus about 35 per
TABLE XI-D. Eelation Between Si02 and FeO in Basic Open-Hearth Slags.*
		5	M				
			3>				
	3 cfl 		 ft		Composition of slag;		
	I!	I**	si.	Limits of SiOa in slag,	per cent.		
p.		^a'd		per cent.			
	ow> 63	o,a	Is!				
							
o		fM	PM'H		SiOa.	FeO.	810,.+ FeO.
1	8	1.85	.068	below 10	9.20	18.45	27.65|
2	10	1.85	.088	above 10	12.54	14.98	27.47
8	15	0.19	. .016	8 to 12 incl.	10.71	25.31	86.02
4	10	0.19	.017	18 to 14 incl.	13.84	21.81	85.65
6	19	0.19	.020	15 to 16 incl.	15.90	18.21	84.11
6	13	0.19	.022	17	17.32	17.97	85.29
7	W	0.19	.025	18 to 19 Incl.	18.94	15.50	84.44
8	12	0.19	.028	20 to 22 incl.	21.57	18.58	85.15
9	7	0.19	.059	28 to 27 incl.	25.48	9.04	84.52
10	16	0.10	.014	10 to 13 inol.	12.28	22.18	84.46
11	14	0.10	.012	14	14.47	22.78	87.25
12	15	0.10	.016	. 15	15.54	21.10	86.64
13	20	0.10	.017		16.46	21.32	87.78
14	19	0.10	.015	17	17.47	19.24	86.71
15	12	0.10	.012	18	18.32	20.02	88.34
16	11	0.10	.018		19.41	17.66	87.07
17	14	0.10	,020	20	20.58	14.92	85.45
18	21	0.10	.016	21	21.51	14.58	86.09
19	17	0.10	.019	22	22.46	18.41	85.87
20	11	0.10	.022	23	23.41	12.40	85.81
21	9	0.10	.028	24	24.48	11.05	85.53
22	12	0.10	.042	25 to 29 Incl.	26.37	10.58	86.95
cent., and with low phosphorus about 36 to 37 per cent. A difference in manipulation would change the absolute percentages, but the attainment of a certain definite content of FeO-f-SiOz seems assured. This conclusion is verified by an examination of the in-
TABLE XI-B. Maxima and Minima in Individual Heats in Table XI-D.
Initial phosphorus in charge; per cent.	Slag showing maximum SiOa ; per cent.		Slag showing maximum FeO; per cent.	
	SiOa.	FeO.	SiO,.	FeO.
1.35 0.19 0.10	16.50 27.35 29.15	6.99 6.63 8.27	9.46 9.53 15.66	27.72 84.47 84.36
* The full records of the above charges will be found in Sec. 45 of my papei on The Open-Hearth Process, in Trans. A.. L M. E., Vol. XXII, p. 436 et sey.